Nicotinic acid bromide: a simple organic salt optical-electrical ferroelastic with high T c .

A new ferroelastic organic salt nicotinic acid bromide (N-Br) was connected by hydrogen bonding with nicotinic acid cations via a halogen substitution strategy. It exhibits a ferroelastic phase transition from P 2 1 / m to P 1̄ with 2/ mF 1̄ Aizu notation with a high Curie temperature ( T c ) of 402 K. Moreover, optical regulation from blue light to white light was achieved by halogen substitution.